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No opportunity windows are predicted in the next 10 days. Conditions can change quickly, so check back for updates.

More Morning Frost in Southern Finland

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Rule Morning Frost

Helsinki - Morning Frost - Southern Finland

Q: What conditions does Morning Frost look for?

Time Window: Sunrise -45m to +90m. Frost Probability: ≥ 60.0%. Wind Speed: ≤ 1.5m/s

Helsingfors, Uusimaa, Finland

Frost crystals on calm, cold mornings near sunrise

No opportunities right now

Here’s what usually blocks matches

No Morning Frost opportunities in the next 14 days

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Rule requirements (key thresholds)

Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Wind Speed · ≤ 1.5m/s

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)

Wind Speed 96% failing

Time Window 88% failing

Frost Probability 69% failing

Currently

Real-time conditions

Frost Probability

50%

Soil Temperature2.9°C

Dew Point-7.6°C (low dew point)

Wind Speed4.0m/s (calm conditions)

Cloud Cover0%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions that create Southern Finland's dramatic frost photography opportunities. From November through March, the region's lakes, forests, and wetlands transform under hoar frost and ice formations, with temperatures regularly dropping to -15°C or colder.

What makes Southern Finland special for frost photography:

Lake ice formations - Vesijärvi and Saimaa develop intricate ice patterns and frozen shoreline details
Torronsuo's frozen bog - The region's largest raised bog becomes an otherworldly landscape of frosted sphagnum and ice-covered pools
Nuuksio forest frost - Hoar frost on birch trees and frozen forest streams create intimate woodland scenes
Accessible winter locations - All major frost photography sites within 2 hours of Helsinki

Peak frost conditions occur during stable high-pressure systems when clear nights drop temperatures well below freezing while daytime sun creates backlit opportunities. Nuuksio's mixed forests develop heavy hoar frost on birch branches, transforming familiar trails into sparkling winter scenes. Torronsuo National Park's boardwalks traverse frosted bog landscapes where every sedge and shrub carries ice crystals. The region's thousands of lakes create endless shoreline compositions—ice formations along reed beds, frozen spray patterns, and geometric crack patterns in smooth ice. The forecast identifies calm, clear nights with appropriate temperature drops, then tracks morning visibility to ensure you can photograph the frost before midday sun melts the formations.

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72-hour requirements breakdown

What passed or failed, hour by hour

0matching hours in the next 95 hours

AND logic: all conditions required

Meets requirement

Misses requirement

Time Europe/Helsinki	Time Window Sunrise -45m to +90m	Frost Probability ≥ 60.0%	Wind Speed ≤ 1.5m/s
Wed, Apr 8
04:00	✕	31%	5.6m/s
05:00	✓	31%	5.7m/s
06:00	✓	46%	5.7m/s
07:00	✓	48%	5.6m/s
08:00	✕	48%	5.5m/s
09:00	✕	60%	5.6m/s
10:00	✕	72%	5.5m/s
11:00	✕	55%	5.9m/s
12:00	✕	51%	5.8m/s
13:00	✕	44%	5.8m/s
14:00	✕	44%	5.7m/s
15:00	✕	42%	5.8m/s
16:00	✕	42%	5.6m/s
17:00	✕	44%	5.1m/s
18:00	✕	44%	4.8m/s
19:00	✕	44%	4.5m/s
20:00	✕	44%	4.4m/s
21:00	✕	50%	4m/s
22:00	✕	52%	4m/s
23:00	✕	59%	4.1m/s
Thu, Apr 9
24:00	✕	59%	4m/s
01:00	✕	59%	4m/s
02:00	✕	59%	4.1m/s
03:00	✕	59%	4.2m/s
04:00	✕	54%	4.1m/s
05:00	✓	50%	4m/s
06:00	✓	50%	3.9m/s
07:00	✓	50%	3.8m/s
08:00	✕	59%	4m/s
09:00	✕	72%	4.6m/s
10:00	✕	70%	4.5m/s
11:00	✕	70%	4.2m/s
12:00	✕	70%	3.9m/s
13:00	✕	66%	3.7m/s
14:00	✕	70%	4m/s
15:00	✕	70%	3.6m/s
16:00	✕	55%	3.5m/s
17:00	✕	55%	3.6m/s
18:00	✕	48%	3.1m/s
19:00	✕	50%	2.3m/s
20:00	✕	46%	2m/s
21:00	✕	46%	2m/s
22:00	✕	46%	2.2m/s
23:00	✕	46%	2.2m/s
Fri, Apr 10
24:00	✕	46%	2.2m/s
01:00	✕	46%	2.3m/s
02:00	✕	47%	2.1m/s
03:00	✕	46%	2.2m/s
04:00	✕	46%	2.3m/s
05:00	✓	61%	2.4m/s
06:00	✓	61%	2.4m/s
07:00	✓	61%	2.3m/s
08:00	✕	61%	2.5m/s
09:00	✕	74%	2.8m/s
10:00	✕	70%	3.4m/s
11:00	✕	70%	3.8m/s
12:00	✕	62%	3.7m/s
13:00	✕	62%	3.7m/s
14:00	✕	56%	3.6m/s
15:00	✕	33%	3m/s
16:00	✕	28%	2.6m/s
17:00	✕	33%	2.3m/s
18:00	✕	35%	1.4m/s
19:00	✕	35%	1.1m/s
20:00	✕	41%	1.5m/s
21:00	✕	43%	1.8m/s
22:00	✕	53%	1.9m/s
23:00	✕	57%	2.1m/s
Sat, Apr 11
24:00	✕	61%	2.3m/s
01:00	✕	61%	2.6m/s
02:00	✕	61%	2.6m/s
03:00	✕	59%	2.9m/s
04:00	✕	55%	3m/s
05:00	✓	59%	3m/s
06:00	✓	59%	2.9m/s
07:00	✓	66%	3.1m/s
08:00	✕	74%	3.3m/s
09:00	✕	74%	3.8m/s
10:00	✕	0%	5m/s
11:00	✕	0%	6.3m/s
12:00	✕	0%	7.5m/s
13:00	✕	0%	6.8m/s
14:00	✕	0%	6.2m/s
15:00	✕	0%	5.6m/s
16:00	✕	0%	5.6m/s
17:00	✕	0%	5.6m/s
18:00	✕	0%	5.6m/s
19:00	✕	0%	5.5m/s
20:00	✕	0%	5.4m/s
21:00	✕	0%	5.4m/s
22:00	✕	0%	5.3m/s
23:00	✕	0%	5.2m/s
Sun, Apr 12
24:00	✕	0%	5.1m/s
01:00	✕	0%	5.2m/s
02:00	✕	0%	5.3m/s

How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Frost Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time Europe/Helsinki	Dew Point °C	Surface Temperature °C	Temperature °C	Time Window	Total Cloud Coverage %	Vapor Pressure Deficit kPa
Thu, Apr 9 Sunrise 06:21 Sunset 20:23
05:00 ☾	-7.6°C	2.9°C	-1.7°C	-	0%	0.19kPa
06:00 ☾	-7.7°C	2.9°C	-2°C	-	0%	0.19kPa
07:00	-7.7°C	2.6°C	-2°C	-	0%	0.19kPa
08:00	-7.9°C	2.1°C	-1.3°C	-	2%	0.22kPa
09:00	-8.7°C	2°C	-0.003°C	-	1%	0.29kPa
10:00	-9.6°C	2°C	1.3°C	-	0%	0.38kPa
11:00	-10°C	2°C	2.8°C	-	5%	0.46kPa
12:00	-10°C	2°C	4°C	-	0%	0.54kPa
13:00	-10°C	2°C	5°C	-	2%	0.59kPa
14:00	-9.4°C	2°C	5.3°C	-	4%	0.59kPa
15:00	-8.9°C	2°C	5.4°C	-	5%	0.58kPa
16:00	-8.3°C	2.3°C	5.2°C	-	7%	0.56kPa
17:00	-7.5°C	2.9°C	4.2°C	-	5%	0.48kPa
18:00	-7.3°C	3.2°C	3.2°C	-	8%	0.41kPa
19:00	-6.7°C	3.1°C	2.5°C	-	17%	0.36kPa
20:00	-6.3°C	2.8°C	1.2°C	-	89%	0.28kPa
21:00 ☾	-6.5°C	2.7°C	0.33°C	-	99%	0.25kPa
22:00 ☾	-6.6°C	2.6°C	0.17°C	-	100%	0.25kPa
23:00 ☾	-6.6°C	2.6°C	0.08°C	-	100%	0.24kPa
Fri, Apr 10 Sunrise 06:21 Sunset 20:23
24:00 ☾	-6.4°C	2.5°C	-0.03°C	-	100%	0.23kPa
01:00 ☾	-6.5°C	2.5°C	-0.12°C	-	98%	0.23kPa
02:00 ☾	-6.8°C	2.5°C	-0.42°C	-	78%	0.23kPa
03:00 ☾	-7.3°C	2.5°C	-0.7°C	-	100%	0.23kPa
04:00 ☾	-7.5°C	2.3°C	-0.75°C	-	100%	0.23kPa
05:00 ☾	-7.7°C	1.9°C	-0.61°C	-	100%	0.24kPa
06:00 ☾	-7.7°C	1.7°C	-0.68°C	-	100%	0.24kPa
07:00	-7.6°C	1.3°C	-0.55°C	-	100%	0.24kPa
08:00	-7.4°C	1.2°C	0.47°C	-	89%	0.28kPa
09:00	-7.6°C	1.2°C	1.9°C	-	5%	0.35kPa
10:00	-8.1°C	1.2°C	3.2°C	-	5%	0.44kPa
11:00	-8.6°C	1.2°C	4°C	-	10%	0.5kPa
12:00	-8.9°C	1.2°C	4.6°C	-	35%	0.54kPa
13:00	-9.2°C	1.2°C	5.1°C	-	39%	0.57kPa
14:00	-9.4°C	1.8°C	5.2°C	-	67%	0.59kPa
15:00	-10°C	2.8°C	5.6°C	-	91%	0.62kPa
16:00	-9.9°C	3.6°C	5.6°C	-	100%	0.62kPa
17:00	-9.2°C	4.1°C	5.3°C	-	100%	0.59kPa
18:00	-8.2°C	4.3°C	4.7°C	-	100%	0.52kPa
19:00	-6.5°C	4.2°C	3.8°C	-	100%	0.43kPa
20:00	-6.8°C	4°C	2.9°C	-	100%	0.38kPa
21:00 ☾	-6.6°C	3.5°C	2.1°C	-	55%	0.33kPa
22:00 ☾	-6.3°C	3°C	1.3°C	-	28%	0.29kPa
23:00 ☾	-5.9°C	2.6°C	0.75°C	-	14%	0.25kPa
Sat, Apr 11 Sunrise 06:18 Sunset 20:25
24:00 ☾	-6°C	2.5°C	0.38°C	-	7%	0.24kPa
01:00 ☾	-6.4°C	2.5°C	0.09°C	-	5%	0.24kPa
02:00 ☾	-6.5°C	2.5°C	-0.11°C	-	7%	0.23kPa
03:00 ☾	-6.7°C	2.5°C	-0.41°C	-	10%	0.22kPa
04:00 ☾	-6.7°C	2.5°C	-0.51°C	-	11%	0.22kPa
05:00 ☾	-6.7°C	2.4°C	-0.63°C	-	5%	0.21kPa
06:00 ☾	-6.8°C	2.3°C	-0.74°C	-	6%	0.21kPa
07:00	-7°C	1.9°C	-0.44°C	-	26%	0.23kPa
08:00	-6.8°C	1.8°C	1.2°C	-	5%	0.3kPa
09:00	-6.6°C	1.8°C	2.8°C	-	5%	0.37kPa
10:00	-3.9°C	3243°C	2.8°C	-	5%	0.29kPa
11:00	-1.7°C	6484°C	2.9°C	-	5%	0.21kPa
12:00	0.3°C	9726°C	2.9°C	-	5%	0.13kPa
13:00	0.2°C	9726°C	2.9°C	-	18%	0.13kPa
14:00	0.1°C	9726°C	2.8°C	-	31%	0.13kPa
15:00	0°C	9726°C	2.8°C	-	44%	0.13kPa
16:00	0.1°C	9726°C	2.7°C	-	31%	0.12kPa
17:00	0.2°C	9726°C	2.5°C	-	18%	0.11kPa
18:00	0.3°C	9726°C	2.4°C	-	5%	0.1kPa
19:00	0.4°C	9726°C	2.3°C	-	5%	0.09kPa
20:00	0.5°C	9726°C	2.1°C	-	5%	0.08kPa
21:00 ☾	0.6°C	9726°C	2°C	-	5%	0.07kPa
22:00 ☾	0.5°C	9726°C	1.9°C	-	35%	0.07kPa
23:00 ☾	0.5°C	9726°C	1.8°C	-	65%	0.06kPa
Sun, Apr 12 Sunrise 06:15 Sunset 20:28
24:00 ☾	0.5°C	9726°C	1.7°C	-	94%	0.06kPa
01:00 ☾	0.6°C	9726°C	1.7°C	-	65%	0.05kPa
02:00 ☾	0.6°C	9726°C	1.7°C	-	35%	0.05kPa
03:00 ☾	0.7°C	9726°C	1.7°C	-	5%	0.05kPa
04:00 ☾	0.7°C	9726°C	1.7°C	-	9%	0.05kPa

How to read: these inputs help produce the derived score; they are not requirements by themselves.

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